1320464257 has 4 divisors (see below), whose sum is σ = 1509102016. Its totient is φ = 1131826500.

The previous prime is 1320464237. The next prime is 1320464267. The reversal of 1320464257 is 7524640231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7524640231 = 163 ⋅46163437.

It is a de Polignac number, because none of the positive numbers 2^k-1320464257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320464237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94318869 + ... + 94318882.

It is an arithmetic number, because the mean of its divisors is an integer number (377275504).

Almost surely, 2^1320464257 is an apocalyptic number.

It is an amenable number.

1320464257 is a deficient number, since it is larger than the sum of its proper divisors (188637759).

1320464257 is an equidigital number, since it uses as much as digits as its factorization.

1320464257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188637758.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 1320464257 is about 36338.1928141728. The cubic root of 1320464257 is about 1097.0898994445.

The spelling of 1320464257 in words is "one billion, three hundred twenty million, four hundred sixty-four thousand, two hundred fifty-seven".